Setup OpenRouter

Single API key, access to ~every hosted LLM.

Why OpenRouter here

• Unified billing and model catalog — easy to swap cheap↔premium per task.
• Live pricing visible per model; easy to pick cost-optimal for bulk runs.
• OpenAI-compatible API — drop-in with the OpenAI SDK.

Procedure

1. Key: check env for OPENROUTER_API_KEY. If absent, ask the user to set it (point at 1Password if they use op-vault). Never print the key.
2. Endpoint: https://openrouter.ai/api/v1 — set as OPENAI_BASE_URL with the OpenAI SDK.
3. Recommended model aliases (update when prices shift — check openrouter.ai/models):